Preparing maps, drawings, &amp;c.



NICOLAS TORNAUW', OF ST. PETERSBURG, RUSSIA.

PREPARING MAPS, DRAWINGS, 8w.

SPECIFICATION forming part of Letters Patent No. 655,813, dated August 14, 1900.

Application filed November 13, 1899.

To a whom it Wtay concern.-

Be it known that I, NICOLAS TORNAUW, a subject of the Emperor of Russia, and a resident of St. Petersburg, Russia, have invented certain new and useful Improvements in Preparing Maps, Drawings, and the Like, of which the following is a specification.

This invention consists of a process Whereby geographical and other maps, drawings, or similar articles intended for purposes of instruction, information, or study (whether printed, photographed, or drawn by hand) are rendered better suited for the purpose by being prepared in such a manner that drawings or marks with chalk, charcoal, crayon, or the like may be made thereon and afterward be effaced without any damage to the surface of the map or the like.

Attempts have been made to render maps, and more particularly geographical maps, suitable for the purpose for which this invention has been devised, but none of them have proved successful, mainly for the reason that their original delineations could not be preserved intact for any length of time.

Now by this invention not only is the original map or print protected from destruction, but its durability is increased, and existing maps,plans,pictures,or thelike may be treated by the improved process in the following manner:

The sheet having the map, plan, picture, or the like printed or drawn thereon is impregnated with any suitable waterproofing mediasuch, for example, as what is known as Enduit pegamoid; butIany other known waterproofing agent may be used, provided it does not impair or injure the paper or the printed or otherwise-delineated matter th ereon. The map after being made impervious to moisture is covered with a thin layer of some transparent and water-resisting adhesive substance. It has been found by experience that the varnish known under the other suitable varnish may be employed.

Before this varnish or coating has had time to dry the surface of the map is by means of a suitable sieve or sifter sprinkled with Serial No. 736,871. (No specimens.)

finely-powdered pumice-stone,emery, or other suitable rougheningpowder. This powder becomes embedded in the adhesive layer and by so doing produces a transparent coating of a roughness sufficient to enable the map to be drawn upon or marked with chalk or the like. When the surface has become dry, the map or the like is ready for use.

The foregoing is a description of the treatment to which an existing map or the like is to be subjected, and the process may be similarly applied with such modifications of detail as the nature of the article may necessitate to other maps, plans, pictures, or the like, including globes, employed for purposes of tuition, study, or information.

Where the object is to produce new maps, pictures, or drawings with the advantages hereinbefore described, the paper, canvas, or other material to be used for the purpose may be waterproofed before the map or picture is drawn or printed thereon; but the adhesive substance and the powdered pumicestone or the like must in all cases be applied after the production of the drawing or print.

As before stated, the process is applicable to a vast variety of articles employed for purposes of teaching, study, or reference, it being particularly suitable for ordnance and school maps, though it may also be used with great advantage for anatomical plates, working or key plans, drawings of machinery, (whether used for tuition or for purposes of construction,) globes, and the like, and the process will also prove extremely serviceable in preparingmaps of ephemeral interest, such as war maps, plans of fortifications, (SEC.

Having now particularly described and ascertained the nature of this invention and in what manner the same is to be performed, I declare that what I claim is- 1. The process substantially as hereinbefore described of treating maps, drawings and the like for the purpose specified, which consists in waterproofing the'same, covering the same with a transparentv adhesive substance, and applying a finely-powdered hard substance thereto.

2. The process substantially as hereinbe+ fore described of treating maps, drawings and the like for the purpose specified, which In testimony whereof I have signed my consists in printing the map, drawing or the name to'this specification in the presence of like upon the proper material, waterproofing two subscribing Witnesses.

said material, covering the same with a trans- NICOLAS TORNAUW. parent adhesive substance, and sprinkling Witnesses: on the adhesive substance while moist a fiuely- KARL .PREIZ,

powdered hard substance. FRANZ HASSLACHER. 

